Here you can find the source of toJavaIdentifier(String s)
public static String toJavaIdentifier(String s)
//package com.java2s; /**/*from w w w . j a v a2 s . c o m*/ * * Copyright 2017 Florian Erhard * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * */ public class Main { public static String toJavaIdentifier(String s) { if (s == null || s.length() == 0) return "V"; if (!Character.isJavaIdentifierStart(s.charAt(0))) s = "V" + s; char[] ca = s.toCharArray(); for (int i = 1; i < ca.length; i++) if (!Character.isJavaIdentifierPart(ca[i])) ca[i] = '_'; return new String(ca); } public static char[] toCharArray(CharSequence chars) { if (chars instanceof String) return ((String) chars).toCharArray(); char[] re = new char[chars.length()]; for (int i = 0; i < re.length; i++) re[i] = chars.charAt(i); return re; } }